IPhone 3GS Screen Replacement?

I slammed the hatch door of my SUV on an old iPhone 3GS. The screen does not look to be cracked, but it has a huge area of dead pixels. What part(s) do I need to replace? Any idea where I can get them (Amazon?) and if you would please include some sort of installation guide that would be great.

here is a photo of the phone

Do it yourself:

Buy all parts and screen for cheap here:
http://www.amazon.com/...003TJJ9SS/
You can also find parts and more detailed instructions here:
http://www.ifixit.com/...lay/1542/1

If you want a professional to do it:
http://www.zeetron.com/products/iPhone-3GS-LCD-Screen-Replacement-Service.html